[IP-268]: bill project tasks

[nielsdrost7]

What

• ProjectBillingService::billTasks(Project, array $taskIds): Invoice — creates one invoice item per selected task (item name = task name, quantity 1, price = task_price, task's tax rate, task_id link). Appends to the client's existing draft invoice when one exists, otherwise creates a new draft with a null invoice number (numbering is assigned when the invoice leaves draft — consistent with the duplicate-prevention observer on PR [IP-513]: duplicate-number prevention via Observers #540, which allows multiple nulls for drafts).
• Only completed tasks that are not already on an invoice (invoice_items.task_id) qualify — double billing is impossible.
• Bill Tasks row action on the projects list (gated by create-invoices) opens a checkbox list of billable tasks; guard failures surface as a notification.
• Invoice totals are refreshed from the item subtotals after billing.

Deviation from the SMART plan: no redirect to EditInvoice after billing — that page didn't exist on develop when this PR was written. It does now (and is further extended by PR #575), so the redirect is a ready-to-do follow-up (#587).

Closes

Closes #268 — Convert project tasks to invoice items for billing

Follow-up issues (not resolved here — reopen if auto-closed on merge)

Closes #587 — No redirect to the invoice edit page after billing project tasks (action only shows a success toast; now unblocked since EditInvoice exists on develop)

Tests

ProjectBillingTest — 5 tests: new draft creation, append-to-existing-draft, double-billing rejection, non-completed rejection, and modal option filtering.

[coderabbitai]

Important

Review skipped

Draft detected.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: d3ca87b0-01f0-40ad-ac31-c18dd2715815

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}